ISO 75

Heat Deflection Temperature (Method B)

Purpose: This test method measures the heat deflection temperature at fixed stress/load.

Sample: ISO bars or 80 x 10 x 4 mm

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Basic Description: The bars are placed under the deflection machine with 0.45 or 1.80 MPa load (66 or 266 psi).  The samples are lowered into a silicone bath and tested at a controlled ramp rate until the end deflection is occurred.  The temperature is recorded.

Method Publisher: https://apmtesting.com/test-methods/iso-75/

Keywords:

• Deflection temperature under load
• Heat deflection temperature

Related Test Methods:

• ASTM D1525 – VICAT softening point
• ISO 306 – VICAT softening point
• ASTM D648 – Heat deflection temperature